The Proof of the Poison

The family of James Sanderson are shocked when the doctor refuses to sign his death certificate. The doctor suspects that he was poisoned. Everyone in the household falls under suspicion – including the two stepdaughters Nina and Kate. Nina eats one of James’ chocolates and falls ill afterwards – that was the way the poison was administered. So it looks as if Kate is the murderer and when she later commits suicide it can only be because she was guilty.